在PDF中获取和搜索图像

ImagePlacementAbsorber允许您在PDF文档的所有页面中搜索图像。

以下代码片段也适用于Aspose.PDF.Drawing库。

要在整个文档中搜索图像：

1. 调用Pages集合的Accept方法。Accept方法接受一个ImagePlacementAbsorber对象作为参数。这将返回一个ImagePlacement对象的集合。
2. 遍历ImagePlacements对象并获取其属性（图像、尺寸、分辨率等）。

以下代码片段演示了如何在文档中搜索所有图像。

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ExtractImagesFromPDF()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Images();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "SearchAndGetImages.pdf"))
    {
        // Create ImagePlacementAbsorber object to perform image placement search
        var abs = new Aspose.Pdf.ImagePlacementAbsorber();

        // Accept the absorber for all the pages
        document.Pages.Accept(abs);

        // Loop through all ImagePlacements, get image and ImagePlacement properties
        foreach (var imagePlacement in abs.ImagePlacements)
        {
            // Get the image using ImagePlacement object
            var image = imagePlacement.Image;

            // Display image placement properties for all placements
            Console.Out.WriteLine("image width: " + imagePlacement.Rectangle.Width);
            Console.Out.WriteLine("image height: " + imagePlacement.Rectangle.Height);
            Console.Out.WriteLine("image LLX: " + imagePlacement.Rectangle.LLX);
            Console.Out.WriteLine("image LLY: " + imagePlacement.Rectangle.LLY);
            Console.Out.WriteLine("image horizontal resolution: " + imagePlacement.Resolution.X);
            Console.Out.WriteLine("image vertical resolution: " + imagePlacement.Resolution.Y);
        }
    }
}

要从单个页面获取图像，请使用以下代码：

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ExtractImageFromAnIndividualPage()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Images();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "SearchAndGetImages.pdf"))
    {
        // Create ImagePlacementAbsorber object to perform image placement search
        var abs = new Aspose.Pdf.ImagePlacementAbsorber();

        // Accept the absorber for all the pages
        document.Pages[1].Accept(abs);
    }
}